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VulnerabilityPublished Updated

CVE-2026-111812: Trafficserver · (Apache Traffic Server's origin_server_auth plugin lets a client force ...)

Affects trafficserverSource GCVE Database

0
Authoritative record:CVE-2026-111812· Critical 10.0

Not known to be exploited · CVSS 10.0 Critical.

Data as of 27 Oct 2026, 07:57 UTC

CVSS 3.1 base score
10.0Critical
How severe the flaw is on the 0–10 CVSS scale.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 21 Oct 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Affected software

ProductAffectedFixed in
Ubuntu 24.04 LTStrafficserverpkg:deb/ubuntu/trafficserver?arch=source&distro=nobleOther threatsAffected
  • 9.2.1+ds-1build1 – 9.2.3+ds-1+deb12u1ubuntu0.1
8 affected builds
Fixed in–
Ubuntu Pro 22.04 LTStrafficserverpkg:deb/ubuntu/trafficserver?arch=source&distro=esm-apps/jammyOther threatsAffected
  • 8.1.1+ds-1.1 – 9.1.1+ds-2ubuntu0.1~esm1
5 affected builds
Fixed in–
Ubuntu Pro 20.04 LTStrafficserverpkg:deb/ubuntu/trafficserver?arch=source&distro=esm-apps/focalOther threatsAffected
  • 8.0.5+ds-1 – 8.0.5+ds-3ubuntu0.1~esm1
6 affected builds
Fixed in–
Ubuntu 18.04 LTStrafficserverpkg:deb/ubuntu/trafficserver?arch=source&distro=bionicOther threatsAffected
  • 7.0.0-5 – 7.1.2+ds-3
4 affected builds
Fixed in–
Ubuntu 16.04 LTStrafficserverpkg:deb/ubuntu/trafficserver?arch=source&distro=xenialOther threatsAffected
  • =5.3.0-2ubuntu1
  • =5.3.0-2ubuntu2
Fixed in–

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

Until a patch is available, consider disabling the origin_server_auth plugin if feasible or applying any recommended workarounds from the vendor. Monitor official Apache Traffic Server channels for updates.

Description

Apache Traffic Server's origin_server_auth plugin contains a critical vulnerability (CVE-2026-111812) that allows an unauthenticated client to force unintended behavior. The vulnerability has a CVSS score of 10.0, indicating it is critical with network attack vector, low attack complexity, no privileges required, no user interaction, and impacts confidentiality and integrity with scope change. Multiple specific versions of Traffic Server are affected.

References

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